
5
SIP features
providescallcontrol(hold,forward,transfer,mediachanges,...)
leverages web infrastructure: security, “cgi-bin”, electronic payments,
PICS, cookies, . . .
web-oriented: return HTML pages (“web IVR”)
network-protocol independent: UDP, TCP, SCTP (or AAL5 or X.25)
extends to presence information (“buddy lists”), instant messages and
event notification
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